我单位在铁道部铁路总医院卫校实验楼施工中,原设计为双层密闭钢窗(不带纱窗),见图1。竣工后,校方根据需要,要求增安纱窗。根据钢窗图集要求:双层密闭钢窗不带纱窗者,窗内层与外层间隔120毫米;带纱窗者间隔180毫米,见图2。这一变更,必需将钢窗从墙上凿除下来,焊接合页等配 Our unit was originally designed as a double-sealed steel window (without screen) in the construction of the experimental building of the Medical School of Railway General Hospital of the Ministry of Railways. See Figure 1. After the completion of the project, the school will require additional screens as required. According to the requirements of the steel window atlas: Double-layer sealed steel window without screens, the inner layer of the window is spaced 120 mm apart from the outer layer, and the interval between the screens is 180 mm. See Figure 2. With this change, the steel window must be cut off from the wall, welded hinges, etc.